Siemens SIRIUS 3RW44 System Manual page 107

Stopping time
Typical applications for DC braking
SIRIUS 3RW44 System Manual
GWA 4NEB 535 2195-02 DS 04
The stopping time determines how long braking torque is applied to the motor.
The braking time should be long enough to bring the load to a complete
standstill.
To achieve a sufficient braking effect until standstill, the load's mass moment of
inertia should not be higher than 5 times the motor's mass moment of inertia.
≤ 5 x J
(J ).
Load Motor
The soft starter has no standstill recognition; if required, this must be
accomplished using external measures.
Motor
torque (M)
M
Nominal
operation
DC braking torque
Motor braking
torque
Figure 6-9:DC braking
Use "DC braking" in lathes (e.g. for tool changeover) and disk saws.
Stopping time
Stop command
at soft starter
Device Functions
Time
s
6-15